SPEAR3 : HLS online results

To get a better idea how the floor moves an HLS system, consisting of 20 sensors, was installed around the whole SPEAR3 ring and along BL12. All sensors are directly on the concrete floor. The main water pipe is a half filled 2 inch PVC pipe with 1 1/2 inch connections to the sensors. For the connection from the SPEAR ring to the BL12 hutch a 1 1/2 inch pipe was installed through a penetration in the wall. The penetration is lower than the rest of the water system, therefore this pipe is fully filled with water. In order to achieve air pressure equilibrium on both sides of the penetration a separate air hose was installed. The same is the case at beam line 13.

The data presented here are filtered mean values for 2 min periods.

The floor movements during the last 48h are visualized here. In order to start the animation of the floor movement check the automatic box below. All graphs are with respect to the reference measurement at the East Pit and the time epoch 48h ago.

The pitch is calculated as (downstream height - upstream height )/distance between the sensors.

The data presented here are filtered mean values for 2 min periods.

BL12 has 5 sensors installed along the beam. For a better visualization they are grouped together in one graph.

BL6 has 3 sensors installed along the beam.

A Heidenhain length gauge is installed on the up beam BPM at BL10 to measure the height change from the floor to the BPM. The length gauge is mounted on the floor and connected to the BPM with an invar rod.

A Heidenhain length gauge was installed on the BPM at BL9 Q7 to measure the height change from the floor to the BPM. The length gauge was mounted on the floor and connected to the BPM with an invar rod. Data were gathered from February 11th 2008 to March 28th 2008.